A) \[10000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[50000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[10\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[1\, \ cm\]
Correct Answer: B
Solution :
When we observe the colours of the thin film oil floating over the surface of water, the thickness of the film must be of the order of the wavelength of visible light. Therefore out of given options \[5000\overset{\text{o}}{\mathop{\text{A}}}\,\] is the correct answer since range of wavelength of visible light is \[4000\overset{\text{o}}{\mathop{\text{A}}}\,\] to \[4900\overset{\text{o}}{\mathop{\text{A}}}\,\].
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